Effect of ion-trap parameters on energy distributions of ultra-cold atom-ion mixtures

Abstract

The holy grail of ion-neutral systems is reaching the s-wave scattering regime. However, most of these systems have a fundamental lower collision energy limit which is higher than this s-wave regime. This limit arises from the time-dependant trapping potential of the ion, the Paul trap. In this work, we studied both theoretically and experimentally, the way the Paul trap parameters affect the energy distribution of an ion that is immersed in a bath of ultra-cold atoms. Heating rates and energy distributions of the ion are calculated for various trap parameters by a molecular dynamics (MD) simulation that takes into account the attractive atom-ion potential. The deviation of the energy distribution from a thermal one is discussed. Using the MD simulation, the heating dynamics for different atom-ion combinations is also investigated. In addition, we performed measurements of the heating rates of a ground-state cooled ${}^{88}$Sr${}^{+}$ ion that is immersed in an ultra-cold cloud of ${}^{87}$Rb atoms, over a wide range of trap parameters, and compare our results to the MD simulation. Both the simulation and the experiment reveal no significant change in the heating for different parameters of the trap. However, in the experiment a slightly higher global heating is observed, relative to the simulation.

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Cited by in corpus (16)

• Observation of trap-assisted formation of atom-ion bound states
• Controlling the nature of a charged impurity in a bath of Feshbach dimers
• Quantum-Logic Detection of Chemical Reactions
• Buffer gas cooling of ions in time-dependent traps using ultracold atoms
• Ultracold ion-atom experiments: cooling, chemistry, and quantum effects
• High-energy-resolution measurement of ultracold atom-ion collisional cross section
• Experimental setup for studying an ultracold mixture of trapped Yb${}^{+}$-${}^6$Li
• Measuring out-of-time-ordered correlation functions with a single impurity qubit in a bosonic Josephson junction
• Quantum control of ion-atom collisions beyond the ultracold regime
• Exploring atom-ion Feshbach resonances below the s-wave limit
• The dynamics of a single trapped ion in a high density media: a stochastic approach
• Cold atom-ion systems in radiofrequency multipole traps: event-drive molecular dynamics and stochastic simulations
• Trap-induced atom-ion complexes: a time-independent approach
• Chaotic scattering and heating in cold ion-atom collisions: two sides of the same coin
• Quantum suppression of cold reactions far from the s-wave energy limit
• False signals of chaos from quantum probes